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Descrizione
For accurate measurements of pH and ORP, the model PHTX-692 and ORTX-692 transmitters provide local indication as well as a 4-20 mA output. The large PHTX-692 LCD can alternately indicate pH, temperature, the sensor’s millivolt signal or the 4-20 mA output. The ORTX-692 measures ORP and provides a similar indication, except for pH. Each model requires only two wires, common for both output and power. No special cables are necessary. The isolated, dc current loop output features high noise immunity, permitting use of a simple twisted pair of wires. A single dc voltage power source can power multiple transmitters. The PHTX-692 uses either a 1000 ohm RTD or 300 ohm thermistor for automatic temperature compensation. Compatible sensors are described in this section.